116 



In its mode of growth this species resembles the species Ch. Duniontice and 

 Ch. cytophaga described below. The germinating spore divides, as in these, into 

 two equal cells giving rise to two creeping filaments growing out in opposite di- 

 rections and giving off new creeping filaments which appear to be later confluent 

 into a pseudoparenchymatous disc in the central part of the basal layer. Usually 

 one erect filament is given off from each of the cells of the basal layer, the outer 



as well as the inner, 

 and not rarely the 

 same cell gives off 

 two filaments, the 

 one behind the other 

 (fig.43£:,f). Most of 

 the filaments attain 

 only a small size 

 and remain unbran- 

 ched , but some of 

 them grow out and 

 become much bran- 

 ched. The most vig- 

 orous filaments are 

 much and repeated- 

 ly branched ; usu- 

 ally each cell bears 

 one or two bran- 

 ches, long filaments 

 or branchlets, but 

 there is no distinc- 

 tion between these 

 two kinds of bran- 

 ches , as transi- 

 tions between them 

 frequently occur. 

 When two branches 

 are borne by the 



fihiments. G, H. more developed, branched erect filanienls, /, end oi' erect filament. SamC CCll, thcy are 

 A-C, E-H :iUO: 1, Z), / ?m : 1. c. . 



very otten not oppo- 

 site but placed near each other on the same side of the cell. In fig. 43 F the 

 last cell of the creeping filament is seen to be somewhat raised above the sub- 

 stratum and ends in a hair. Transitions between creeping and erect filaments thus 

 appear to occur; however, I have never seen the transformation of a creeping filament 

 into a true erect one. The cells are cylindrical, by ramification frequently a little 

 broader at the upper end. The stellate chromatophore contains a distinct central 

 pyrenoid. 



Fig. 43.! 



Chantransia polyblasta. (From Hals). /I— C.fyoung plants seen Irom above. ]), more 

 developed plant seen from above. E, F, plants seen from the side with short erect 



